Start and End Day of a Week

Hi,

how can I get the first and last day of a week given the year and the
week number ???

example

week 3 of 2003 starts in Jan 12th and ends on Jan 18th.

how to know the last two values given the year and the number of week ?

thanks.

Best Regards.

--
Luis Magaña.
Gnovus Networks & Software.
www.gnovus.com